<!doctype HTML>
<html>
<head>
<style>
html {
  background: lightpink;
}
div {
  position: relative;
  width: 200px;
  height: 200px;
  background-color: red;
  left: 150px;
  top: 150px;
}

</style>
</head>
<body>
<div></div>
</body>
</html>
